You should check for breathing for no more than 10 seconds. The American Heart Association and the American Red Cross both use this 10-second cap as the upper limit for assessing whether someone is breathing normally before starting CPR. In practice, most guidelines recommend spending 5 to 10 seconds on this step, enough time to detect breathing without dangerously delaying chest compressions.
Why the Time Limit Matters
Every second counts during cardiac arrest. Brain damage becomes likely after just 5 minutes without blood flow, and death becomes likely after about 8 minutes without CPR. That narrow window is the reason guidelines are so strict about keeping your assessment brief. Spending too long trying to figure out whether someone is breathing can cost the person their life.
The risk of performing chest compressions on someone who doesn’t actually need them is far lower than the risk of not compressing when they do. This is why current guidance leans toward acting fast: if you’re unsure whether the person is breathing normally after 10 seconds, treat it as if they’re not and begin CPR.
What You’re Looking For
During those 5 to 10 seconds, you’re scanning for normal, rhythmic breathing. The traditional method involves three things at once: looking at the chest for rise and fall, listening near the mouth and nose for airflow, and feeling for breath against your cheek. You can do all three simultaneously by placing your ear close to the person’s face while watching their chest.
The key word here is “normal.” Gasping, gurgling, or irregular labored breaths do not count. These are called agonal breaths, and they’re a sign of cardiac arrest, not real breathing. Agonal gasps happen when the brain is starved of oxygen, and they look nothing like calm, steady respiration. They’re often slow, sporadic, and can sound like snoring or choking. If you see only gasping, the person needs CPR immediately.
Lay Rescuers vs. Healthcare Providers
If you’re a bystander with no medical training, the process has been simplified over the years specifically to help you act faster. You check for responsiveness by tapping and shouting, scan for breathing, and if the person isn’t responding and isn’t breathing normally, you call 911 and start chest compressions. You don’t need to check for a pulse. Pulse checks are unreliable without training, and the time spent searching for one delays CPR.
Healthcare providers follow a slightly different protocol. They check for breathing and a pulse at the same time, and both assessments share the same 10-second window. For pediatric patients, the instruction is identical: feel for a pulse for no more than 10 seconds while simultaneously looking for breathing. If there’s no definite pulse within that window, compressions begin.
Special Situations With Different Timing
Drowning is the major exception to standard timing. Because the core problem in drowning is oxygen deprivation rather than a heart rhythm issue, airway and breathing take priority over chest compressions. Current guidelines recommend giving 5 initial breaths before starting compressions, compared to the usual 2 in standard CPR. The breathing check itself still follows the same 10-second rule, but the response shifts toward getting air into the lungs faster.
Hypothermia is another exception. In someone pulled from cold water, the pulse can be extremely faint and slow. Guidelines recommend extending the pulse check to 30 seconds in hypothermic patients, because starting chest compressions on someone whose heart is still beating (just very slowly) can actually trigger a dangerous heart rhythm. This is one of the rare cases where taking more time to assess is safer than acting immediately.
The 2025 Guidelines
The American Heart Association released updated guidelines in October 2025, and the core timing hasn’t changed. The 10-second ceiling for assessment remains the standard. One notable shift is in terminology: the AHA no longer uses the phrase “rescue breaths.” Instead, they simply refer to “breaths,” whether given with a pulse present or during CPR. The simplification is part of a broader effort to make instructions less confusing for rescuers under stress.
The guidelines also flag an ongoing question in the field: whether healthcare professionals should even check for a pulse before starting CPR, given how often pulse checks are inaccurate and how much time they consume. For now, the pulse check remains part of the professional protocol, but its future isn’t guaranteed. For lay rescuers, the advice is already clear: skip the pulse, check breathing for no more than 10 seconds, and start compressions if anything looks wrong.